<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="button" @click="add" value="添加数据">
        <input type="button" @click="del" value="删除数据">
        <ul>
            <li v-for="(it,index) in arr">
                {{index+1}}黑马程序员校区：{{it}}
            </li>
        </ul>

        <h2 v-for="item in vegetables" v-bind:title="item.name">
            {{item.name}}
        </h2>

    </div>

    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

    <script>
        var app = new Vue({
            el: "#app",
            data: {
                arr: ["北京", "上海", "成都", "广州"],
                vegetables: [
                    { name: "西兰花炒蛋" },
                    { name: "蛋炒西蓝花" }
                ]

            },
            methods: {
                add: function () {
                    this.vegetables.push({ name: "花菜炒蛋" });
                },
                del: function () {
                    this.vegetables.shift();
                }
            }

        })
    </script>
</body>

</html>